How to prevent and control citrus anthracnose? Mastering these methods is key
(1) Reasonable fertilization. Increase the application of organic fertilizers, such as plant ash and rapeseed cake fertilizer, to improve the physical and chemical properties of the soil and create good conditions for root growth; according to the measured soil properties, carry out formula fertilization with nitrogen, phosphorus, potassium and micronutrients. (2) Reasonable pruning and thinning of branches and fruit. Combined with garden clearing and year-round management, prune diseased and pest-infested branches...
(1) Reasonable fertilization. Increase the application of organic fertilizers, such as plant ash and rapeseed cake fertilizer, to improve the physical and chemical properties of the soil and create good conditions for root growth; according to the measured soil properties, carry out formula fertilization with nitrogen, phosphorus, potassium and micronutrients.
(2) Reasonable pruning and thinning of branches and fruit. Combined with garden clearing and year-round management, prune diseased and pest-infested branches, clear away dead branches and fallen leaves, and burn them in a centralized manner to reduce sources of the pathogen; in summer, according to tree vigor, carry out heading-back pruning to improve ventilation and light penetration in the orchard; thin fruit in a timely manner and control the fruit load to maintain tree vigor and the disease resistance of the tree body.
(3) Timely pesticide application for protection. Treat differently according to the region and the incidence of anthracnose in the orchard over the years. For orchards with severe damage to new shoots, spraying is needed for protection during the spring shoot germination period and each time new shoots emerge. For old orchards and orchards with severe pre-harvest fruit drop and stem-end rot during storage, after fruit set, in combination with the control of scab and black spot, spray once every about 20 days, for 3 consecutive sprays, with particular attention to chemical control during the plum rain season. From late August or early September, depending on rainfall, spray 2 more times for protection to protect the fruit stalk and fruit from infection. Effective agents include: a) 80% mancozeb wettable powder at 600 times dilution; b) 25% imidamide emulsifiable concentrate at 500-1000 times dilution or 50% imidamide manganese salt complex wettable powder at 1500 times dilution; c) 10% fenbuconazole? water-dispersible granules at 2000-2500 times dilution; d) 77% copper hydroxide wettable powder at 800-1000 times dilution.